Machine



(No' Model.) 2 Sheets-Sheet 1.

A. H. RANDALL.

' LATHE CENTER GRINDING MACHINE.

No. 349,602. Patented Sept. 21, 1886.

x "at I illl With/e65 'e-s (No Mo'dl. 2 Sheets-Sheet 2.

A.H.RAND ALL. LATHE CENTER RINDING MACHINE. No. 349,602. PatenttdSepLfZl, 1886.

5y hi6 fllborneys" ore m nd N. PETERS. Fhobouihngnphar. Wuhington'. D, C.

- UNITED STATES PATENT OFFICE.

ALFRED HAROLD RANDALL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR QF ONE-HALF TO HERMAN H. LEUCHSENRTNG, OF SAME PLACE.

LATHE-CENTER-GRINDING MACHINE.

SPECIFICATION forming part. of Letters Patent No. 349,602, dated September 21, 1886.

A Application filed Junelfi, 1885.

To all whom, it may concern:

Be it known that LALFRED HAROLD RAN- DALL, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented 5 certain new and useful Improvements in Lathe- Center-Grinding Machines, of which the following is a specification.

My invention relates to certain details in the construction of a lathe-center-grinding IO machine, with the view of permitting the ready tion of the face-plate and puppet-head of the lathe. Fig. 3 is a plan view. Fig. 4 is a transverse section on the line 1 2, Fig. 2. Fig.

2 5 5 is a transverse section on the line 3 4, Fig.

2, and Figs. 6, 7, and 8 are. detached views of parts of the device.

Referring to Fig. 1,' A is the head-stock of the lathe, B the puppet head, the slide- 0 rest, a the center the conical end of which is to be ground, a" the face-plate, and b the puppet-head spindle, all of the usual construction.

D is the frame of the grinding device, this frame having a V-shaped socket, d, Fig. 4,

slotted on each side at e e, for the reception of the legs f of a detachable clamp-yoke, E,

said legs having at their lower ends laterallyprojecting pins f, which engage with lips g 40 g on the socket d.

The clamp Ehas a set-screw, F, which bears upon a clamp-plate, h, and when the device is applied to the puppet-head spindle b and the set-screw F tightened the plate h will be 5 pressed upon the top of the spindle, and the socket d of the frame D will be drawn up against the under side of the said spindle, thus insuring the true centering of the frame D, irrespective of the diameter of the puppethead spindle. As the socket d has bearingfaces d at each end and the plate 71. is equi- Serial No. M1907. (No model.)

distant between said bearings, athrcepoinled grip upon the spindle is obtained, thus insuring the firm retention of the frame on the spindle.

Pivoted to the frame I) by a bolt, :7, is a frame, G, having lugs j j, to which is secured a spindle, H, free to turn and slide, on which is a sleeve, I, carrying the pulley k and grinding-wheel J, the latter being made, in the present instance, of emery,and being secured to the sleeve by a nut, is.

To a groove in the sleeve I is adapted a two-part ring, K, having a pin, k, which projects into a slot, 1, in a lever, L, pivoted at Z to the frame G. This lever has a suitable handle, 1", so that by means of the lever a 1ongitudinal movement can be imparted to the sleeve I. I 1

Rotation of the ring K with the sleeve I is prevented by the projection of the pin is into a slot, m, formed in the frame G, as shown clearly in Fig. 8.

The frame G can slide vertically on the frame D, said frame having a slot, 07., for the reception of the pivot-bolt i, and to a groove, a, in the face of the frame D is adapted a block, M, perforated at '13, for the passage of the bolt t, and having a threaded orifice, i, Fig. 7, for the reception of a screw-bolt, p, which passes through a segmental slot, q, in the frame G, Fig. 8. On loosening this screw the frame can be adjusted on the bolt 1' to different angles, depending upon the taper of the center a, the frame G being firmly secured to the frame D after adjustment by tightening the screw-bolt p and the nut i on the bolt 6.

If desired, the frame G can be moved vertically on the frame D, the nut 45 being loosened, so as to permit the blockM to slide freely 0 in the groove n, the extent of this movement being determined by the diameter of the center a.

The grinding-wheel J is driven from the faceplate c in the following manner: A spindle, S, has a projecting arm,S', which is adapted to the usual slotted tool-post, c, secured to the slide-rest G of the lathe. On the spindle S is, in the present instance, a V-shaped pulley, T,

having a long hub, T, carrying a frictionrcc drum, U, which is in contact with the periphery of the face-plate a of the lathe. A belt,

'0, passes around the pulley T and around the pulley on the sleeve I, this belt being preferably elastic, and being shown in the drawings in the form of a spiral spring, so that it can readily yield to permit the use of the device on lathes having face-plates of different diameters. By turning the usual transverse feeding-screw controlling the slide-rest the friction-wheel U can be moved into or out of contact with the face-plate a, the rotary movement of the grinding-wheel being thus started and stopped at the will of the attendant without stopping the lathe.

WVhen a slot in the face-plate extends to the periphery, I fill the outer portion of the slot with a piece of wood, in order to make a conti nuous bearingsurface, as will be readilyunderstood.

It will be seen that the adjustment of the grinding-disk to the diameter and facial angle of the center-pin is effected without any corresponding adjustment of thedriving devices carried by the tool-post of thelathe, the latter occupying a fixedrelation to the faceplate.

By providing the fixed frame or carrier D with a clamp occupying such relation to the fixed frame and grinding device that it can be applied to a spindle projecting from the puppet-head of the lathe, I am enabled to effect the ready application of the device to the lathe, the device being properly centered when the clamp is tightened on the projecting spindle of the puppet-head, and no further adjustment being required, except that necessary to bring the grinding-spindle to bear on the conical end of the center-pin and regulate the angle of traverse of said grindingdisk to accord with the angle of said conical end.

It will be observedthat as the arm S, which carries the driving drum U, is rigid there must be a rigid bearing of said driving-drum against the periphery of the face-plate a of the lathe, more effective driving being possible by this arrangement than when the driving-drum is pressed against the periphery of a rotating portion of the lathe by means of a spring.

I claim as my inventionl. The combination, in alathe-center-gri nd'- ing machine, of a fixed frame or carrier, D, and a supplementary frame pivoted to and adjustable across the face of said fixed frame, and the grinding-disk carried by said adjustable supplementary frame, all substantially as specified.

, 2. The combination, in alathe-center-grinding machine, of the fixed frame or carrier D, the supplementary frame pivotedv to and adjustable across the face of said fixed frame, and a grinding-disk carried by and movable across the face of said supplementary frame in a direction inclined in respect to the direction of movement of saidframe across the face of the fixed frame, all substantially as specified.

3. The combination, in a lathe-center-grinding machine, of a grinding device and a carrier therefor secured to a spindle projecting forward from the puppet-head of the lathe, with driving mechanism carried by the toolpost of the lathe, all substantially as specified.

4. The combination, in a lathe-center-grind ing machine, of a grinding device and a fixed frame or carrier, D, therefor, with driving mechanism carried by the tool-post of the lathe, and comprising a belt-pulley and drum carried by a rigid arm secured to the toolpost, the drum being driven by frictional contact with the periphery of the face-plateof the lathe, and the pulley receiving a belt for driving the grindingdisk, all substantially as specified.

5. The combination, in alathe-center-grinding machine, of the grinding device, a carrier therefor having'a V-shaped socket adapted to the puppet-head spindle of a lathe, and a detachable yokehaving a clamp-plate and setscrew, whereby said frame is clamped to the puppet-head spindle, all substantially as speci fied.

6. The combination of the grinding device, the carrying-frame D, having a V-shaped socket, d, with slots 0 c and ears the yoke E, having legsf, with projections f, the clampplate h, and setscrew F, all substantially as specified.

. 7. The combination of the frame I), having a groove, n, and slot n, the block M, adapted I00 to the groove, the frame G, having a segmental slot, q, the pivot-pin i, and the boltp, all substantially as specified.

8. The combination of the frame D, the

frame G, hung thereto and adjustable thereon, I05

and having a groove, m, the grinding device having a sleeve, I, the slotted operating-lever L, and a ring adapted to a groove in the sleeve I, and having a projection adapted to the slot in the lever L and to the groove mof the no frame G, all substantially as specified.

' ALFRED HAROLD RANDALL.

Vitnesses:

D. GooDBRnAD, JOHN H. DALE. 

